Machine-chuck.



l. G. HALLAS.

MACHINE CHUCK.

APPLICATION F1LED1uNE15.1911 5.

1,242,182'. Patented 001. 9,1917.

muni/V701? tonie srnrns rainer.. cierren.

JAMES AGr. HALLAS, OF KENOSHA, WISCONSIN MACHINE-CHUCK.

reeaiea T 0 'all whom 'it may concern.' l

Be it known that I, JAMES G. HALLAs, a citizen of the United States, and resident of Kenosha, in the county of Kenosha and State of iVisconsin, have invented new and useful Improvements in Machine-Chucks, of which the following is a descriptiom reference being vhad to the `accompanying' drawings, which are a part of this specification.

The invention relates to work holders or vises more particularly for use on Shapers, plancrs and milling machines.

The usual form of work holder for machines of this character consists of fixed and movable jaw members with means for operating the movable jaw, the xed jaw member also forming the supporting base for the work. The diihculty with devices of this kind isA that the work is not held firmly against the base of the holder and the essential object of this invention is to obviatethis difficulty by providing an attachment which may be used in connection'with the usual form of work holder and which automatically 'exerts a downward pressure upon the work to hold it against the supporting base ywhen the work is secured within theholder. i The invention'further consists in the several features hereinafter set forth and more particularly 'defined by claims at the conclusion hereof.

j In the drawings: p Y

Figure 1 is a view of the device embodying the invention, parts being broken. away and parts being shown in section;

Fig. 2 is a section taken on the line 2 2 of Fig. 1;

Fig. 3 is a section taken on the line v3-3 Vof Fig. 1;

Fig. 4 is a detail vertical sectional view of a 'modified form of the device.

The device with which theiattachment is combined comprises a fixed jaw member 10 provided withV a jaw 11 and supporting base 12, a movable jaw member 1 3 having a. devpending portion 14 slidably mounted in a 'guideway 15 in the base 12, and means for moving the jaw 13 with respect to the jaw 11v and its base 12. This means consists of a screw shaft 16 having threaded engagement with the portion 14 of the member 13 and Specification of Letters Patent.A

'Patented oct. e, ier?.

Application inea June 15, 1916. serial N. 103,712.

`11 and 13. These pins'19 serve to keepl the block 18 Vin proper position withrespect to the base. It sometimes happens that the work is wider at one end than at the other and .to provide for properly gripping the work I have formed the block with a vertically extending guide 22 having a convex surfacer23 disposed centrally of the block and adapted to contact with the faceof either jaw member so that the block may be inclined with respect to the jaws to accomvmodate for irregular pieces of work.

The block 18V is providedv with a trans versely extending circular bore 24 formed near the top and the outer side 25 of the block has a transversely extending inclined Aslot 26 leading from the outer side 25 ofthe block 18 to the bore 24. This bore 24 and the connecting slot 26- form an openingfor receiving a gripping member 27. This member 27 comprises a curved portion 28 which is adapted to be seated in the bore 24 and a Y downwardly inclined portion 29 integral with the portion 28 andadapted to project through the slot 26 and beyond the outer side 25 `ofthe block, the sides of said portion 28 converging to a transversely extending rounded work engaging edge 30. The seating of the portion 28 within the bore 24 allows "of limited pivotal movement of the member 27 with respect to the block, the side -31v ofthe slot 26 serving as a stop for this in )urpose The member 27 is normallyheld up against the side 31 by 'a spring 32 which is secured to it at one-endv by a screw 33,an'd washer 34 and-its other end is seated in a recess 35 in the block 18. lt will be noted that the shape of the member 27 is such that Yits work engaging edge 30 is disposed below the axis of' theportion 28 and at -a distance from the lcen-ter bore 24v and portion 28. The other end of the gripping member is provided witha Vthreaded bore 36 for Ireceiving a screw 37 carrying a washer 38, said washers 34 and 38 serving to secure said member against endwise movement within the block.

As previously pointed out the attachment is adapted tobe placed adjacent either the fixed. or the movable jaw member, or as shown in Fig. l an attachment may be disposed against the gripping faces of both jaw members.

The arrangement of the gripping member and block and the disposition of the work engaging edge with respect to the pivotal support of the gripping member withinY the block is such that when lateral pressure is applied to the work engaging edge it will move downward, thus exerting a downward force upon the work upon the table and at the same time exerting alateral force to coperate with the other jaw member Vor with the gripping member of the attachment disposed against the other member. In brief when the attachment is positioned against the gripping face of the iixed K jaw member and the work is disposed between said attachment and the movable aw member, and the movable jaw member is vmoved inwardly, the work will be gripped between the movable jaw and the gripping member, and, as the vise is tightened, the gripping member exerts both a lateral force against theV work and a ,downward force causing it to be iirmly pressed against the supporting base of the viser It will be noted that ythis gripping member acts automatically to. perform the functions above pointed out when brought into engagement with the work. If attachments are used for both jaw members, each will opera-te as above pointed out, and the work will be held against lateral movement between thegripping members and will also be held tightly against the supporting baseof the vise through the downward force automatically exerted by the gripping members against the work lwhen theyk are brought into engagement therewith, as shownin Fig. l where-the work 39 rests on spacing blocks 40.

In Fig. 4- I have shown a slightly modified form of devicek in which the blocks of the attachment are made integral with the jaws of the vise and a similar gripping Ymember is secured and connected thereto as the gripping member of the construction first described and the action and function Vof the gripping member is the same in this instance as that previously described.

The invention thus exemplifies a vise in which one or both of the gripping faces of the vise are provided with movable gripping members which exert both a lateral and downward force against the work and do thisV automatically on their being brought Vmally maintaining said into engagement with the work through the i block removably connected with one of said jaw members and slidable along the base and having a transversely extending bore near the front side thereof and a slot extending from the front side to said bore, a member mounted within said bore for limited pivotal movement and having a gripping portion extending outwardly through the slot and provided with a work engaging edge disposed in a plane below the plane of the pivotal axis of said member to automatically exert a lateral and downward pressure against the work on the tightening up of the jawv member.

2. The combinatiomwith a vise comprising a fixed member having a supporting base, a movable jaw member'and means for `operating said movable jaw member, of a block operatively connected with one of said jaw members, a grippingmember pivrotally secured in said blockl and having a work engaging edge projecting outwardly from the same and disposed below its pivotal axis to automatically exert a downward pressure against the work on the tightening up of the jaw members,and means for normally maintaining said gripping member in Y its upper position.V

3, The combination, with a vise comprising a fixed jaw member having a supporting base, a movable jaw member and means for operating said movable jaw member, of a vblock operatively vconnected with one of said jaw members, a gripping member pivotally secured in said block andy having a work engaging edge projectingV outwardly from the same and below itsv pivotal'axis to automatically exert a downward pressure upon the work on the tightening up of the jaw members, and a spring secured to said block and gripping member to maintain said gripping member in its normal upper position. f 'l Y 4. An auxiliary attachment fora machine vise comprising a block having squared ends, a gripping member pivotally secured iii said block and having a work `'engaging edge projecting outwardly from the same below its pivotal axis, and means for norgripping member in its upper position.

In testimony whereof, IA` aflix my signature.

JAMES e. Harinas,

Washington, D. C.

i C opies of this patent may be obtanedfor five centsieach, by addressing the Commissioner of fatents, i 

